You can configure the Menu widget to provide navigation to the customers to another page(menu): 
Select Menu: Select the ‘Menu’ that are added in the “Designer -> Menu Builder” option. Here you will get the searchable drop-down option to search & select the Menu.
Enable Logo: Enable logo to display the portal logo in the menu of the customer portal. 
Enable Profile Navigation: Enable the profile navigation and set the redirection link to display the profile navigation in the menu.
Menu Location: You can set the Menu Location (Menu view) as either Vertical or Horizontal. 
Note: You will get the vertical option enabled only when the page layout ration is less than 50%. (i.e., 25% + 75%)